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These were from U.S. comics publishers such as Timely, Atlas - and their later incarnation, Marvel Comics - ACG, Charlton, Archie and their Red Circle and M.L.J imprints, Fawcett, King Features comics and newspaper strips, Lev Gleason and Sterling.
Other companies for which Giacoia did art during the 1940s and 1950s include Crestwood, Dell Comics, Eastern Color, Fawcett, Harvey Comics Lev Gleason Publications and Timely Comics, the 1940s predecessor of Marvel Comics.
For Fawcett Comics, he did work in Hot Rod Comics, an adaptation of the 1951 John Huston film The Red Badge of Courage and "a couple of Westerns", including the movie spin-off feature "Lash LaRue".